Toshifumi Noumi
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View article: Holographic entanglement entropy in the FLRW universe
Holographic entanglement entropy in the FLRW universe Open
A bstract We compute the holographic entanglement entropy via the Ryu-Takayanagi prescription in the three-dimensional Friedmann-Lemaître-Robertson-Walker universe. We consider two types of holographic scenarios analogous to the static pat…
View article: Gravitational EFT for dissipative open systems
Gravitational EFT for dissipative open systems Open
A bstract We elaborate on the effective field theory (EFT) construction for dissipative open systems coupled to dynamical gravity, in light of recent developments on the EFT of dissipative hydrodynamics (HydroEFT). Our construction is base…
View article: Gravitational EFT for dissipative open systems
Gravitational EFT for dissipative open systems Open
We elaborate on the effective field theory (EFT) construction for dissipative open systems coupled to dynamical gravity, in light of recent developments on the EFT of dissipative hydrodynamics (HydroEFT). Our construction is based on the S…
View article: Cutoff scale of quadratic gravity from quantum focusing conjecture
Cutoff scale of quadratic gravity from quantum focusing conjecture Open
We derive the cutoff length scale of the quadratic gravity in d≥5 dimensional spacetime by demanding that the quantum focusing conjecture for the smeared quantum expansion holds at the classical level. The cutoff scale has a different depe…
View article: Gedanken experiments to destroy a black hole by a test particle: Multiply charged black hole with higher derivative corrections
Gedanken experiments to destroy a black hole by a test particle: Multiply charged black hole with higher derivative corrections Open
We investigate a gedanken experiment to destroy an extremally charged black hole by dropping a test particle, provided that there are multiple U(1) gauge fields coupled with each other through higher derivative interactions. It is known th…
View article: Gravitational positivity for phenomenologists: Dark gauge boson in the swampland
Gravitational positivity for phenomenologists: Dark gauge boson in the swampland Open
The gravitational positivity bound gives quantitative “swampland” constraints on low-energy effective theories inside theories of quantum gravity. We give a comprehensive discussion of this bound for those interested in applications to phe…
View article: Cutoff Scale of Quadratic Gravity from Quantum Focusing Conjecture
Cutoff Scale of Quadratic Gravity from Quantum Focusing Conjecture Open
We derive the cutoff length scale of the quadratic gravity in $d \geq 5$ dimensional spacetime by demanding that the quantum focusing conjecture for the smeared quantum expansion holds at the classical level. The cutoff scale has different…
View article: Gedanken Experiments to Destroy a Black Hole by a Test Particle: Multiply Charged Black Hole with Higher Derivative Corrections
Gedanken Experiments to Destroy a Black Hole by a Test Particle: Multiply Charged Black Hole with Higher Derivative Corrections Open
We investigate a gedanken experiment to destroy an extremally charged black hole by dropping a test particle, provided that there are multiple $U(1)$ gauge fields coupled with each other through higher derivative interactions. In the absen…
View article: Analytic formulae for inflationary correlators with dynamical mass
Analytic formulae for inflationary correlators with dynamical mass Open
A bstract Massive fields can imprint unique oscillatory features on primordial correlation functions or inflationary correlators, which is dubbed the cosmological collider signal. In this work, we analytically investigate the effects of a …
View article: Analytic Formulae for Inflationary Correlators with Dynamical Mass
Analytic Formulae for Inflationary Correlators with Dynamical Mass Open
Massive fields can imprint unique oscillatory features on primordial correlation functions or inflationary correlators, which is dubbed the cosmological collider signal. In this work, we analytically investigate the effects of a time-depen…
View article: Phenomenological motivation for gravitational positivity bounds: A case study of dark sector physics
Phenomenological motivation for gravitational positivity bounds: A case study of dark sector physics Open
Positivity bounds on scattering amplitudes provide a necessary condition for a low-energy effective field theory to have a consistent ultraviolet completion. Their extension to gravity theories has been studied in the past years aiming at …
View article: Black hole extremality in nonlinear electrodynamics: a lesson for weak gravity and Festina Lente bounds
Black hole extremality in nonlinear electrodynamics: a lesson for weak gravity and Festina Lente bounds Open
A bstract We study black hole extremality in nonlinear electrodynamics motivated by the Weak Gravity Conjecture (WGC) and the Festina Lente (FL) bound. For illustration, we consider the Euler-Heisenberg model and the Dirac-Born-Infeld mode…
View article: Duality and supersymmetry constraints on the weak gravity conjecture
Duality and supersymmetry constraints on the weak gravity conjecture Open
Positivity bounds coming from consistency of UV scattering amplitudes are not always sufficient to prove the weak gravity conjecture for theories beyond Einstein-Maxwell. Additional ingredients about the UV may be necessary to exclude thos…
View article: Finite energy sum rules for gravitational Regge amplitudes
Finite energy sum rules for gravitational Regge amplitudes Open
A bstract We develop a framework to derive consistency constraints on gravitational Regge amplitudes based on the finite energy sum rules (FESRs), which directly connect gravitational Regge amplitudes at a finite ultraviolet scale with inf…
View article: Black Hole Extremality in Nonlinear Electrodynamics: A Lesson for Weak Gravity and Festina Lente Bounds
Black Hole Extremality in Nonlinear Electrodynamics: A Lesson for Weak Gravity and Festina Lente Bounds Open
We study black hole extremality in nonlinear electrodynamics motivated by the Weak Gravity Conjecture (WGC) and the Festina Lente (FL) bound. For illustration, we consider the Euler-Heisenberg model and the Dirac-Born-Infeld model in asymp…
View article: Gravitational Positivity for Phenomenologists: Dark Gauge Boson in the Swampland
Gravitational Positivity for Phenomenologists: Dark Gauge Boson in the Swampland Open
The gravitational positivity bound gives quantitative "swampland'' constraints on low-energy effective theories inside theories of quantum gravity. We give a comprehensive discussion of this bound for those interested in applications to ph…
View article: Stability of hairy black holes in shift-symmetric scalar-tensor theories via the effective field theory approach
Stability of hairy black holes in shift-symmetric scalar-tensor theories via the effective field theory approach Open
Shift-symmetric Horndeski theories admit an interesting class of Schwarzschild-de Sitter black hole solutions exhibiting time-dependent scalar hair. The properties of these solutions may be studied via a bottom-up effective field theory (E…
View article: Higher derivative corrections to black brane thermodynamics and the weak gravity conjecture
Higher derivative corrections to black brane thermodynamics and the weak gravity conjecture Open
A bstract We study higher derivative corrections to black brane thermodynamics and their implications for the weak gravity conjecture for p -form gauge fields. In particular we show that higher derivative corrections decrease tension-to-ch…
View article: Finite energy sum rules for gravitational Regge amplitudes
Finite energy sum rules for gravitational Regge amplitudes Open
We develop a framework to derive consistency constraints on gravitational Regge amplitudes based on the finite energy sum rules (FESRs), which directly connect gravitational Regge amplitudes at a finite ultraviolet scale with infrared phys…
View article: Higher derivative corrections to black brane thermodynamics and the weak gravity conjecture
Higher derivative corrections to black brane thermodynamics and the weak gravity conjecture Open
We study higher derivative corrections to black brane thermodynamics and their implications for the weak gravity conjecture for $p$-form gauge fields. In particular we show that higher derivative corrections decrease tension-to-charge rati…
View article: Page curve and symmetries
Page curve and symmetries Open
A bstract Motivated by the quantum process of black hole evaporation and its implications for symmetries, we consider a qubit system with a random dynamics as a toy model of black hole. We compute its symmetry-resolved entropies and discus…
View article: Stability of Hairy Black Holes in Shift-Symmetric Scalar-Tensor Theories via the Effective Field Theory Approach
Stability of Hairy Black Holes in Shift-Symmetric Scalar-Tensor Theories via the Effective Field Theory Approach Open
Shift-symmetric Horndeski theories admit an interesting class of Schwarzschild-de Sitter black hole solutions exhibiting time-dependent scalar hair. The properties of these solutions may be studied via a bottom-up effective field theory (E…
View article: A strategy for detecting non-gaussianity of stochastic gravitational waves
A strategy for detecting non-gaussianity of stochastic gravitational waves Open
View article: Phenomenological Motivation for Gravitational Positivity Bounds: A Case Study of Dark Sector Physics
Phenomenological Motivation for Gravitational Positivity Bounds: A Case Study of Dark Sector Physics Open
Positivity bounds on scattering amplitudes provide a necessary condition for a low-energy effective field theory to have a consistent ultraviolet completion. Their extension to gravity theories has been studied in the past years aiming at …
View article: Erratum to: Proof of new S-matrix formula from classical solutions in open string field theory: Or, deriving on-shell open string field amplitudes without using Feynman rules, Part II
Erratum to: Proof of new S-matrix formula from classical solutions in open string field theory: Or, deriving on-shell open string field amplitudes without using Feynman rules, Part II Open
View article: Proof of new S-matrix formula from classical solutions in open string field theory: Or, deriving on-shell open string field amplitudes without using Feynman rules, Part II
Proof of new S-matrix formula from classical solutions in open string field theory: Or, deriving on-shell open string field amplitudes without using Feynman rules, Part II Open
We study the relation between the gauge-invariant quantity obtained by T. Masuda and H. Matsunaga (arXiv:1908.09784) and the Feynman diagrams in the dressed $\mathcal {B}_0$ gauge in the open cubic string field theory. We derive a set of r…
View article: Gravitational positivity bounds on scalar potentials
Gravitational positivity bounds on scalar potentials Open
We derive constraints on scalar field theories coupled to gravity by using recently developed positivity bounds in the presence of gravity. It is found that a canonically-normalized real scalar cannot have an arbitrarily flat potential unl…
View article: Is the Standard Model in the Swampland? Consistency Requirements from Gravitational Scattering
Is the Standard Model in the Swampland? Consistency Requirements from Gravitational Scattering Open
We study compatibility of the standard model of particle physics and general relativity by means of gravitational positivity bounds, which provide a necessary condition for a low-energy gravitational theory to be UV completable within the …
View article: Is the Standard Model in the Swampland
Is the Standard Model in the Swampland Open
Obviously no, leading to a necessary condition for quantum gravity. We study compatibility of the Standard Model of particle physics and General Relativity by means of gravitational positivity bounds, which provide a necessary condition fo…
View article: Effective Lagrangian for Nambu-Goldstone modes in nonequilibrium open systems
Effective Lagrangian for Nambu-Goldstone modes in nonequilibrium open systems Open
We develop the effective field theory of diffusive Nambu-Goldstone (NG) modes associated with spontaneous internal symmetry breaking taking place in nonequilibrium open systems. The effective Lagrangian describing semiclassical dynamics of…